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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b1fca53bf7672922144c72071fdb060d4a463f669bf58e5d0753c9303c9026' 
  AND token = 'lsaN75s32MfrZ7TLAi+OR189TzjGV5UPzXSl0OYkrq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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