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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f758ebdccf468ce4f868bf35ef4e4fbf1fe0a9feb7b829c097ada2f117610951' 
  AND token = 'CTxCEoqYov0P6FDE6CvjpeAc9tuCIls+FZxvemIVBRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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