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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e93d8ac8860a1dbba998e068088cb1fc2f82367454b28c9031f33c7b127292' 
  AND token = 'gQGSjERLpbrJ4Ro7DPjitZq0kAK5jDQ2+QrZsaXAsy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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