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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacb0890f8fce2b3016ba61233f826d8702694da3f2ccd11860bf65809e67e73' 
  AND token = 'sZJOKyA4eMe5SEtCXtthZ7a6pbFCw41sUTQi6mNQO44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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