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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a07aa4b72b9ed43556331489bbeae9432498ea3843bc8f48aca175dbcefdecb' 
  AND token = 'lyFgSkuLO+qtWz5vmbi9fS0/I5Q3bDCscgcZqChOa9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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