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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20567b0deee4b74895de74f2e48c2acedd7f74960696f76c1d563f00a050fe3e' 
  AND token = '8BkP1zhufyp3F3Nb/oDDUGsAoXrkGvXNhpU5auJ4e68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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