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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14462b66fb9c9151f8dfa81b783a56ef056951b4c0ac8078d91547ad97d33860' 
  AND token = 'h4IAEm8A30O2eM8tJnd2Ty4HKSxfiz6qY6wQa2HA8P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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