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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08afbe397a67c943060992e66fcd8fae18d811c9eb06363b17b98f09319b5998' 
  AND token = 'S6a4A7Gq4+QsUti6hvYs+9NR4L6N7ezH3FnLhjCNnwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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