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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eed8ed4f21a97c69ed62f8deccf809b186158af753ac9a8dc9fc326e808c8f8' 
  AND token = 'r0Y5Hcfy/swwDW9ebjHEfc1riwXCO+W2+5iooaSKeiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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