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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863f96a8f82ee644dc88755c3bd37008d1c33c47ffeb2116e48bbe5e550418ef' 
  AND token = '5hLdHHrWg/0f/MaX+aVVvVXSN01VESew9qdUatjbVFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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