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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e28ed9560abe2968864c333a7f2acccf9741bf2c28616d0a7ccbbbd03f841b58' 
  AND token = 'L2R/UduiXn7xQbsv3cri7TgtXndex17JJ6i9OhQ+JuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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