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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a86334f2a0fba95bcac3c1902862fca703092c5bbcd0b1f394da17bb5a570bc' 
  AND token = '9QfJfeFcwR1P44MxIiUrI0L7TbMTa1X6rVLws6iYnDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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