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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831cda89f7b0a26ee63040d774c2c78c857385ca9bdbf13b76947cf3e6142e6a' 
  AND token = '37am9kT83EOZwFChnz4M9qW7TCw6BZBCSeorfmyVqOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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