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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee740593039025ec6bb39c9b2aee9433fbb6c46c4914b629d026557b8ae61cb' 
  AND token = '8DoMWT7wGYKUPcgxNIaEyekSYa21K7DHJnKABc1LOUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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