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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da50c6b3fa2f084cb71e5a005528e3b2454ca04cd697cfb52162774687b94e02' 
  AND token = 'w8/AHd76UOpsnEiEQpcVYtpGq55VHzgu+/N8paIryxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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