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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f0a22a896fdf2a3c49657bf0a56d45f94bd8b961813509717dd3de563179d2' 
  AND token = 'sgoabDoK1PRbb99YZgDf5oynLf80YjzR187UpY7jaI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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