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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eeb65bdb8903686e09605124fe0c9ed6d463323c33a3292590c897a5c0467b4' 
  AND token = 'YG3tMPKgfypj0AgRuApqZIEm3m2MOEe3YfWW5QHNMqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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