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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e26dbd57c2ab9da8e9e64d518123574b22a4ad42b4cf57b05a488a090c0d3c0' 
  AND token = 'dD5d399AP+izbdL3YGzgBExlKilgPmfpm7wsbQNhBvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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