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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8733a321aaa9a0bf5c3ba27677df1f3558393c9bd574252d15f0fa5acf2c6a04' 
  AND token = '7aTksG+3ebnHGIHsLdAuvFejBZEGTCltxvsbXeg+ddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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