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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3238b41391fa45344a36f1023b3ac88632818a395392c6662c39b61320dff41c' 
  AND token = 'F3i+IRrT/WuL8z/2jngeDyzWnwxcAIDnBl35/VMwAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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