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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2becd3ab411a0414d9c1946987744bb517c4af36ce18282eb248e9f85073487b' 
  AND token = '6rTc5dlfrZ4iTOmFGvVxG+fpu/XM9rLz70iFoVUs1QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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