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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51dc0055a48558b95f96d5da927aef82d8412669f60e609b815995fad415cf6e' 
  AND token = 'Yg3Yh5P9i63Gm5OXGnG7Ubq4c8xa4JnBEVnH8kRJ0fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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