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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7691f632f4b99725f987a6aaecbbca12fa0d9d86e47ced83f3076f75a71767' 
  AND token = '6T8OPaDTNbqRMID5C4auNwf3YN/t/2S61lgHdKPoXBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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