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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1acd2f8609e23d0567dd88021d989cc796e1a9c7359b360cf12f101249edb75c' 
  AND token = 'RS/4g7sdp3/hrB3qLMwssGtq0D9NHU4r92nzbQ9vw8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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