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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929d4cd2103db013c9ee8e8571fc9c4036cc31bfa0d3ecb30aa442a9cbf24768' 
  AND token = 'x9PA3wVImXspDa+WhsstuDka+RlQwfJhiComavJt5Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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