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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0acb7320410e4505fe2d165b4b0c05e41b2bc11307fd60de8a6e79aab3fb8b' 
  AND token = 'wDhz4RP+1e7v2bDXktiQdy4FjIgYpm1XvXh0OV1ljlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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