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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938ecab9ffdbe6af3d99a6b191ee55363f7513bcdebc45b7535c5ac3b64c2c86' 
  AND token = '1bwLQg0lWs7L2YCOntEZ5KNODvC9CZ13fA5dTg+sVYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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