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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b0ce867b15397ae17a33b60682d0f649fe70373dec002330f96133322eddd8' 
  AND token = 'bzbD/T/VY7g/0+1qfUWRSqv4mwA/J/CWTVSTxWN32zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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