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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c1f790b8e8e51d02f7f8590d4f72ff526c3b52e8e631425797f13f39491c1b' 
  AND token = '9LoU4qm2X9cFPRgfYeaA3JukqbwGabrqc9YdZKRkyQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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