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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed273aa8e99634d0a9f3e378d52ccf44eae3f56a2dd914c9386cedad2db3218' 
  AND token = '8Gd3suHfPEeOiOtgU4RFl3M/V8G0h6OD1i/JJuaNUck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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