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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b8fc62f981d5c8c3264851fbeabde325c1693390b4b28a811af4d2f55eb060' 
  AND token = 'zTObmcCzswDkw15N7EMdZI9LN3uefFCcbU1FpSm1ecs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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