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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c5d45beeac0f5677b24ed5c1a4af6b339aac9892def0c071b0462d025cb3f1' 
  AND token = 'bhQyQ45B3zlzViRNhMvR9fGyoC9I36FB4I3QG7zsbDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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