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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b531d4f9904356137031fbd17abe13a4d88ecd3b711666fb87acd953e84f35ef' 
  AND token = 'kFDMRxw9rpdy/b/ISxmOxSjaUq+0g6Nbf6ZVOufQWyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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