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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f25003f2cde11bb99ba9f94ebf72479fc00a93693093a8ad86e31a061a2e19' 
  AND token = 'uBx0XK7fL0SJtSMC6RLKj3JQ7RZ+QLBYRBGBk8U6jXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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