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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcf372130ef2d984923e6d8f575b88bf32f85c68a2563f19ffcbe745f3a7d9d' 
  AND token = 'RjpLz56w+02B8PAye05RDd9cS7Hpq19ZpMZXnqTHvbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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