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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42a3a4a0fcad93ae1bcfdfcfa32204196d982dbf0201736058c392ce9801e17' 
  AND token = 'GrfTKk4sBh0qQgOOA+o8bbz2A4uX7zdPTEcelB5hizw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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