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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dd1d3cec94d4045d989fb24bbd264e40b70577974231f187e718cb617805d1' 
  AND token = 'LSECR9BAxSyi8gEGBbutbYi0TJUwyfQRhvC24N9wAfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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