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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcc70b8d4cb5780fe1d547b5e9c5f86f4339149bfe062bed18a80ceace2d5c3' 
  AND token = 'jwT1fgaKrhs5t9yr+72wYxggclCiAPb7ssOTAJBQofs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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