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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94aead8f2474180f6cd9ba36287987ec4b5baf53f7e9ea9763f32a29b8fa0a39' 
  AND token = 'XIMZvvbFpJYVlsp90Sky3beUrjPwXLq9PBeZm5m6DDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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