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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4944285db6174eaac16fe6b408a3bc8aa96f749ec350e545c8589779973fbc8e' 
  AND token = 'ALOQMny2P1oO7vaG/THGPZ6P6Yk/iOjGQR0ZwgHdn70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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