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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bef2c05a913cae2daecbfc99b2140153457045d41f3a4bdf295385c64e0cc7' 
  AND token = 'OX0aktEDsJramGGjE6G2dk1sYt59S7Rd5rp8JJGRxS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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