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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddc9e9768eca2b951dc92023694a872bc588dc8c4aadaf667693d3daa525500' 
  AND token = 'AAylVExuPnhRbDCPvKvke9YcDtJqEhW3OF4j2sfJD9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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