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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5c11aedf33c86424bf0b14c2cc4438a621f358fb0b24ceb9db44ab2921efb1' 
  AND token = 'zyy9lubq+r0tJsKUAaVY5V2RaQ52gXsXR1YccuIqN5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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