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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f808941a46b0d9d23d17f56de8f16e909e2c5a8e59b012e3c97cda4d0ac0f4a' 
  AND token = 'xiUCjKrPALOQ21ilJ+w6Gbnz4e6GPA13zsUy30MyrQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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