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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01547c164d2ee19debf6360101cfbc0d314ca0dc5b64cf5454639208031dedcf' 
  AND token = 'uXdzxHmP4ki3CIdKFSREQ5SYJteK+1JTw3t2PEbelzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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