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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b666060c8b778066e4751a487e2b69770d74e3fcf81299daeb35bd1ab2dc6f6' 
  AND token = 'PtqP/tYQ9fgooqOs2i9ldi+730skmCL5kNUAlSvmUyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}