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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf47894c78b17e31d1388e3da77c9b628294136ada54462e947b08e9620a217' 
  AND token = 'z5kk7cmYioM2pRcRSVJys6EdWUy85uRVAogj1SbAAOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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