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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f747c5f7e9d4e4cb8b142174b10d81550509ea4f747e19d8c47449bafb6cdb93' 
  AND token = 'Sc+Azv83YyizhIH7j8lNKeBd48MNseSe0Y9N5c78ATQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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