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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e49ac8ad058caa709d87db39e81624f8618d7d3f1d5f15e71ed5d98087da84' 
  AND token = 'N5b9ABs8J/z0VtampDyGzTatm9sKV3JZ4phzqLp/X7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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