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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64ad93cc2752ea24e3a8c64266387d2a262a71a248ce793a62c9cf235c525ef' 
  AND token = 'zhecsFGaHr0UgA2bRpN3gLGHW3L/WcXdQ8pI2ui9GGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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