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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3339e31f8938895867e08dcc74371799576f815c5ba5084a7a7a7aaf5c81dc' 
  AND token = 'u8U4ajVqPQKrjcKi4mqcTWS1gicT5Qh/EpWgzqera8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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