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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2751940630ea425d535055e382810e619a1e132fe503e8be7f60aaa581ed3a' 
  AND token = 'WCqrcjujzvJkxUB4QQtLLx6dLr8tBX4Px+bpRwp3htE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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