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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19db16480b8e51681045a12eb821864b1ced6d1bbea6ac2a7d898c55ee6b9014' 
  AND token = 'JXXoWvSu5WFdv8PYt5U5d2TRi+yKLqmz0MUTD41fCEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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