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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60654dda9c2e88291616d94bd3746eef75d2fd9e3580d29bd2ce70417f7c25e1' 
  AND token = 'ivnmstUZgYLo3A+DwHnT3RiCsetHiRO5pvGmS5kXTeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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