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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9baa8848ccacb04a22d35157c964b73fb07d8f427296bb905e9227d3f24ad2c3' 
  AND token = 'HaTuBfi2Usz1ZBJCRQ+q2JWeD9LxnzttNAIrNacFB0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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