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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0af5ee91d628d2d2c06a2cf0039f7ed6ff0378051345ca62a31b7d1e92f823' 
  AND token = 'YYKtKhLmpsE26Q9+W3wx22NeO7bgq2OouD2cNdX46pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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