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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f6cd8de1b0b205c96fabd325236927af0ac061e1061bc32cac80a00e030b14' 
  AND token = 'ScoeIS9JpDxwdjRTCWg6fg8VTptOkrFpt49g2fHXxGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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