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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e908cdc9b985a016042a2054aa69bbe809b4711c9dd6f41624d0ce6480668958' 
  AND token = 'daL8LQQN7pwGEhebNHGk8LAUinlrk1obvJ3/1A4Xv3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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