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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7ae8b2577b1b390423b3b9517fbb2db7023798d5f16fa252da1706296f01fe' 
  AND token = 'BbDaTtH9KXKe26u19lFfF91ElfoSJvmo3Hvf7nHzuAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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