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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cff092c122be1ab921a6bfd25e3bd86d244915196c9363ff2779101e8de5e8d' 
  AND token = 'YPGtFIgsR+g5ACY+lRh8xCI5aAqVqi3yk1YMBrA4ngk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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